Problem 4 Using a Radical Expression

Academics Some teachers adjust test scores when a test is difficult. One teacher's formula for adjusting scores is A = 10 R , eh equals 10 square root of r comma  where A is the adjusted score and R is the raw score. If the raw scores on one test range from 36 to 90, what is the range of the adjusted scores?

✓ Got It?

4. In Problem 4, what are the adjusted scores for raw scores of 0 and 100?

✓ Lesson Check

Do you know HOW?

Find all the real square roots of each number.

1. 25
2. 0.16
3. − 64 negative 64

Simplify each radical expression.

4. 9 b 2 square root of 9 , b squared end root
5. a 8 b 18 square root of eh to the eighth , b to the eighteenth end root
6. − 125 a 3 3 cube root of negative 125 , eh cubed end root ,

Do you UNDERSTAND?

7. Error Analysis A student said the only fourth root of 16 is 2. Describe and correct his error.
8. Vocabulary Explain the difference between a real root and the principal root.
9. Reasoning A number has only one real nth root. What can you conclude about the index n?